Water and grease proof paper.



em Avaimeis ARTHUR 13. LITTLE, or BROOKLINE, MASSACHUSETTS, ASSIGNOR To oELLULosE PRODUCTS COMPANY, OF WILMINGTON, DELAWARE, A' CORPORATION OF DELAWARE.

o sense PROOF PAPER.

SPECIFICATION forming part of Letters Patent No. 691,951, dated January 28, 1909. i

' Application filed May 27, 1901. Serial No- 62,l41. (No specimens.)

To all whom it may concern.-

Be it known that I, ARTHUR D. LITTLE, of Brookline, in the county of Norfolk and State of Massachusetts, have invented an Improve- 5 ment in Water and Grease Proof Paper, of which the following description is a specificstion. I

This invention has for its object the production of a new and improved paper which [0 is practically both water and grease proof,

such paper being especially adapted for wrap-' ping food products and other articles which may be greasy in themselves and liable to be injured by exposure to moisture. V

The invention consists, essentially, in facing one side-of any sort of paper, preferably unsized, with recovered cellulose by depositing thereon a continuous film of viscose solution'and decomposing the viscose, which results in the recovery of the cellulose,and there after filling the other side with a waterproof ing material, as paraffin.

In carrying outmy invention I lightlybr ash or coat one side of the paper with a viscose solution, which may be prepared after the general plan set forth in United States Patent No. 520,770, using for this purpose an ordinary coating-machin'e, which is preferably supplied with vegetable-fiber brushes, or pass the paper under a doctor before which the viscose solution, of such strength as will not readily penetrate the paper, is held. The paper thus coated is dried in any suitable way and the viscose upon'it decomposed, and both of these results may be obtained by passing treated paper upon and over drying cans or cylinders. It is desirable to dry the paper rather slowly at first in order to avoid the formation of bubbles in the film of viscose which is deposited or laid therein. As soon 6.

as the viscose coating has dried the tempera ture may, be raised to 212 Fahrenheit or thereabouts to complete the decomposition of v the viscose, resulting in the production of the recovered cellulose. Various methods for decomposing the viscose are described in United States Patent No. 604,206,which may be adopt? ed. The decomposition is completed and the cellulose fixed when bits of paper dipped in water yield onlyinorganic salts. 'The treated 5,6 -j

paper is now preferably'washed in water in the continuous way after themannerfamili'ar 7 in the treatment of-parchment-paper, and it-- 7 is then again dried by thepassag'e over dry ing-cylinders, after which it is ready for the fi'nal treatment for the purposes of rendering 'it waterproof. The other side of the paper,

notfaced oncovered with viscose, is impregnated with paraflin or other suitable waterproofing material by brushing or otherwise applying melted par'afiinor' other material or a solution containing paraffin or other water proofing material to that side of the paper and :3

removing the excess of material by squeezing rolls,do ctors, or in any other suitable manner. 6 5

I claim-- As a new article of manufacture, paperfilledon one side with waterproofing material, and faced on the other side with recovered cellulose, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ARTHUR D. LITTLE.

-Witnesses: a I

Brl-NOYES, t JOHN DEOBOW.. 

